The morning light is faint, and the sun paves a layer of golden. Li Kangping got up and went to the cafeteria on campus.

A cup of coffee, a slice of chocolate syrup, thick buttered toast, this is Mr. Li's breakfast, and he buys a copy of the New York Daily News and reads the newspaper while eating.

Li Zhuxi has not registered for courses this semester, and Li Kangping is not in a hurry to register for courses, he strolls around the campus of Columbia University after breakfast to further familiarize himself with the environment.

Columbia University was founded after King George II and was known as King's College.

After the United States became independent and no longer subject to the British Empire, President Lowe moved the college to Morning Side Heights and renamed it Columbia University.

By 1920, Columbia University was a well-known comprehensive university.

Professor John Dewey, the father of American philosophy, sat at Columbia University and attracted talented people from all over the world.

At the invitation of his disciples, Professor Dewey went to Peking University to give lectures at the end of 1919 and had not yet returned to the United States.

European physicists such as Na Lorentz and Planck were hired by the Columbia Research Institute to help American physics thrive.

Lorenz and Planck have returned to Europe, and the physics department of the Columbia Institute is now chaired by a group of American physicists.

Li Kangping visited the Department of Physics of Columbia University Research Institute, and he learned the latest news about Columbia University Physics.

Columbia physics can only represent the strength of physics in the eastern United States. In the twenties of the twentieth century, the global physics centers were in Europe, in Göttingen, in Berlin, in Munich, in Cambridge, in Zurich, in Paris.

Li Kangping walked out of the Hertley Building, full of thoughts.

At this moment, a black Ford Sedan slowly drove up and stopped at the door of the Hertley Building.

Two men got out of the car, and the man who came out of the cockpit was an oriental face, about thirty-five or sixteen years old, wearing a gentleman's hat, a high-end suit, and an ivory Malacca cane.

Li Zhuxi's surviving memory contained information about this person, and Li Kangping took off his hat and saluted: "Mr. Zhou." ”

Mr. Zhou lives in New York, and he is a member of the Geng Foundation and handles all matters related to the study of students in the United States.

"Kangping, how are you doing lately?" Mr. Zhou's Mandarin Chinese, with a soft accent from Jiangsu and Zhejiang, gives people the impression of being both grand and elegant.

Li Kangping replied: "I am still familiar with the environment of Columbia, step by step, and there is no big problem. ”

"Okay." Mr. Zhou nodded and said, and he immediately introduced the person next to him to Li Kangping: "This gentleman is Hou Debang, Marquis of Min, a 1913 Tsinghua student studying in the United States, and is now studying for a doctorate in chemistry at the Graduate School of Columbia University. Studying at Columbia University, the two of you should be on the move and communicate with each other. ”

Li Kangping said respectfully: "In Xiaguang, Li Kangping, a 1920 Tsinghua student studying in the United States, has seen Brother Debang. ”

When Brother Debang was about thirty years old, he took off his gentleman's hat and said kindly, "Which academy does Kangping study?" ”

Li Kangping said: "Columbia College." ”

Brother Debang asked, "Columbia College has a lot of subjects and miscellaneous, which one are you going to major in?" ”

"Physics."

"Physics is very difficult, and there are many people who give up halfway. May you overcome all difficulties, succeed in your studies, and contribute to the cause of science in China. ”

The Department of Physics and the Department of Chemistry of the Columbia University Research Institute are located in the Hertley Building, and Brother Debang chatted briefly before taking his leave and entering the Hertley Building.

Mr. Zhou took out a money order, and he said: "The living expenses of the official student in the United States for one year are 300 US dollars, Kang Ping, you can exchange this money order for cash at Western Union." New York is quite expensive, you should be as frugal as possible, and you will have to pay for anything more than $300. ”

"Thank you, Mr. Zhou." Li Kangping took the bill of exchange and talked with Mr. Zhou for a long time.

The construction of Tsinghua University is funded by the Gengzi indemnity returned by the United States, and the Gengzi Foundation is operated independently, and the Beiyang government does not interfere in the management and operation of the foundation.

The tuition and accommodation fees of Geng students studying in the United States are fully covered by the Geng Foundation, and they can also receive $300 per year for living expenses.

$300 is not a huge fortune in New York City, the level of consumption in New York is really high, Li Kangping bought some this, bought some that, took a taxi for sightseeing, hired a personal trainer, and spent dozens of dollars in just one day.

In the afternoon, Li Kangping came to the teaching building of Columbia College to listen to Professor Joseph Rosberg's atomic theory course.

Columbia College is one of Columbia's undergraduate colleges, and it only accepts male students, so the lecture halls are all male students.

"Think about it, why do atoms change this way and not that? Why do atoms radiate light? Professor Rosberg asked the students in the audience.

Li Kangping replied first: "Entropy, I think it has something to do with entropy." Radiation proceeds in the direction of increasing entropy. ”

"This gentleman is right, it has to do with entropy." Professor Rosberg nodded, and he said, "It doesn't mean that it wants to throw away its energy, and when it radiates, the total energy of the world is still the same as it was before the radiation......

Li Kangping listened carefully to the lectures, and from time to time wrote and drew in his notebook.

Towards the end of the class, Professor Rosberg left a question for thought: find the binding energy of hydrogen atoms through your derivation.

"Every Tuesday night, Mr. Stephen Anderson organizes tutorials in Room 6 of the Vermont Building, so if you're having trouble with atomic theory, don't miss Mr. Anderson's tutorials."

Professor Rosberg announced the end of class and left the classroom.

This problem requires the application of Bohr's theory of stationary transitions in the structure of hydrogen atoms. Li Kangping quickly deduced and calculated on paper, let the Bohr radius be R1, and considering that the mass of the electron is less than the mass of the nucleus, he obtained △E=e^2/8πε0R1.

"Professor, Professor Rosberg!" Li Kangping caught up with Professor Rosberg at the entrance of the teaching building.

"Ho, it's you." Professor Rosberg had an impression of Li Kangping.

Li Kangping handed over the answer sheet: "Professor, I'm done." ”

"So fast?"

Professor Rosberg took the answer sheet, and after a quick glance, he said, "You're the fastest one, and your answer and process seem to be correct, should I give you an A, Mister?" ”

"Lee, my name is Kangping Lee."

Professor Rothberg reviewed the answer sheet again, and after a while, he said with certainty, "Mr. Lee, for this question, I think I should give you A." How do you spell your name? Write it yourself. ”

Li Kangping took the answer sheet, signed Kangping Lee on the paper, and then handed in the answer sheet, and he said, "Thank you, professor." Also, I want to enroll in your atomic theory course. ”

"What? You haven't enrolled in my course yet? Professor Rothberg was surprised, and he asked, "So Mr. Li, how many classes have you auditioned?" ”

"Listen to them all." Li Kangping made up a white lie.

Now that the young man had auditioned the previous lessons, it was not surprising. Professor Rosberg clipped Li Kangping's answer sheet into the lecture book, and he said, "I will tell Mr. Anderson, you go to Mr. Anderson tomorrow to register." ”